Cannot drop messages in a specific mailbox

[StCyr]

Steps to reproduce

1. Select a message from any mailbox
2. Try to move it in a specific mailbox
3. See the stop sign while dragging the message over the mailbox's entry

Expected behavior

I don't see any reason why I shouldn't be able to move a message in that mailbox: it's not a special mailbox, and I'm not using ACL

Actual behavior

Impossible to drop a message in that mailbox

Mail app version

5.6.7

Nextcloud version

32.0.5

Mailserver or service

postfix and dovecot

Operating system

Debian 13

PHP engine version

Other

Nextcloud memory caching

no

Web server

Apache (supported)

Database

MariaDB

Additional info

php 8.4